Casualties unknown

1999-05-27: Grumman-schweizer G-164A (N9970) — Prescott, WA

Prescott, WA, US

On May 27, 1999, a Grumman-schweizer G-164A (registration N9970) was involved in an aviation accident near Prescott, WA. Investigators recorded the probable cause as: The pilot-in-command's failure to maintain directional control during the takeoff roll and overloading of the right landing gear strut. Contributing factors were the soft takeoff surface, confined (narrow) takeoff surface, and high vegetation. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards

During takeoff, a Grumman G-164A AgCat veered left off a narrow sandy airstrip after its left wing and spray boom contacted adjacent wheat, causing the aircraft to rotate and sustain structural damage.

Accident Details

A Grumman G-164A 'AgCat' aircraft experienced a loss of directional control during takeoff from a soft, sandy airstrip approximately 15 feet wide. After about 900 feet of takeoff roll, the aircraft rolled off the left side of the airstrip, which was also used as a road. The aircraft came to rest after rotating roughly 200 degrees counter-clockwise from the takeoff heading. High wheat flanked both sides of the landing strip at the time of the accident.

Structural Findings

Post-accident examination revealed no evidence of any mechanical malfunction with the aircraft. However, structural overload was noted: the left wing spray boom retention arm aft brackets had separated in overload, and the right main landing gear strut also separated during the event.

Operator Report

The operator reported that the left wing and spray boom entered the wheat along the side of the airstrip, pulling the aircraft off the strip and into the wheat field. The pilot was unable to recover directional control using the rudder. The aircraft subsequently sustained damage as a result of the encounter with the wheat and the ground.

Aircraft Information

The accident aircraft was a Grumman G-164A 'AgCat', a single-engine agricultural aircraft commonly used for crop dusting and spraying operations.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18898. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.